Ever feel like your in a box, you have the key to the box but your captor wants you to give it to them before they lock it down and padlock you in.
Not for any particular physical reason. It won't change your general situation, of the overall encompassing nature of your confinement.

But it's important for them to know that when they get the knife out, you won't scream.

For that, they need to feel justified. Yeah. I know where this is going.